You can execute the SHOW statement to view database information such as database lists, database tables, and columns or indexes of tables.
SHOW DATABASES
You can execute the SHOW DATABASES statement to view the databases in the current cluster.
Syntax
SHOW DATABASES; Examples
SHOW DATABASES;The following information is returned:
+--------------------+
| Database |
+--------------------+
| adb_test |
| MYSQL |
| adb_demo |
| INFORMATION_SCHEMA |
+--------------------+SHOW TABLES
You can execute the SHOW TABLES statement to view the tables in the current database.
Syntax
SHOW TABLES [IN db_name]; Examples
SHOW TABLES IN adb_demo;The following information is returned:
+--------------------+
| Tables_in_adb_demo |
+--------------------+
| customer |
| json_test |
+--------------------+SHOW COLUMNS
You can execute the SHOW COLUMNS statement to view the columns in a table.
Syntax
SHOW COLUMNS IN db_name.table_name; Examples
SHOW COLUMNS IN adb_demo.customer;The following information is returned:
+---------+---------+------+------+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+---------+---------+------+------+---------+-------+
| id | int | NO | PRI | NULL | |
| name | varchar | YES | | NULL | |
| address | varchar | YES | | NULL | |
| gender | boolean | YES | | NULL | |
+---------+---------+------+------+---------+-------+SHOW CREATE TABLE
You can execute the SHOW CREATE TABLE statement to view the statement that is used to create a table.
Syntax
SHOW CREATE TABLE db_name.table_name; Examples
SHOW CREATE TABLE adb_demo.customer;The following information is returned:
+----------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+----------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| customer | Create Table `customer` (
`id` int NOT NULL,
`name` varchar(50),
`address` varchar(80),
`gender` boolean,
primary key (`id`)
) DISTRIBUTED BY HASH(`id`) INDEX_ALL='Y' STORAGE_POLICY='HOT' BLOCK_SIZE=8192 |
+----------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+SHOW GRANTS
You can execute the SHOW GRANTS statement to query the permissions of a user.
Syntax
SHOW GRANTS [FOR 'username'@'hostname'];username specifies the username, and hostname specifies the hostname or the IP address of the host.
Examples
View the permissions of the current user without the need to specify the username or hostname.
SHOW GRANTS;The following information is returned:
+---------------------------------------------------------+ | Grants for adb_acc@% | +---------------------------------------------------------+ | GRANT ALL ON `*`.`*` TO 'adb_acc'@'%' WITH GRANT OPTION | +---------------------------------------------------------+View the permissions of the specified user.
SHOW GRANTS FOR 'test'@'%';The following information is returned:
+---------------------------------------------------------+ | Grants for test@% | +---------------------------------------------------------+ | GRANT ALL ON `*`.`*` TO 'adb'@'%' WITH GRANT OPTION | +---------------------------------------------------------+
SHOW INDEXES
You can execute the SHOW INDEXES statement to view the indexes of a table.
Syntax
SHOW INDEXES FROM db_name.table_name; Examples
SHOW INDEXES FROM adb_demo.json_test;The following information is returned. Key_name indicates the name of an index.
+-----------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+-----------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| json_test | 1 | id_0_idx | 1 | id | A | 0 | NULL | NULL | | BTREE | | |
| json_test | 1 | vj_idx | 1 | vj | A | 0 | NULL | NULL | | BTREE | | |
+-----------+------------+----------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+